query-planner

Google Cloud Spanner Query Planner Visualizer

build your own query planner

An eBPF based query planning tracer for PostgreSQL

Run the PostgreSQL Explain Visualizer 2 (pev2) from the command line.

Context Runtime — a database query planner for LLM context. Decides what a model sees before it answers; plans it, runs it through reused substrate, and learns from the outcome.

A tiny relational database written in Go

A minimal educational relational database management system (RDBMS) implemented in Java 17. The project demonstrates a custom SQL processing pipeline, including lexer, parser, semantic analysis, query planning, optimization, and execution. It features a storage engine with heap pages, a buffer pool, and supports indexing using B-trees and Hash

Hypothetical IVFFlat indexes for pgvector: test planner choices in EXPLAIN without building a physical index

From-scratch database systems lab with SQL parser, slotted pages, WAL recovery, direct paged B+Tree index reads, query planner, and guided Workbench UI.

openCypher front-end in Rust. Lex · parse · sema · plan · optimize · cost. Ships an MCP server (cypher-mcp). Storage-agnostic. v0.10 shipped.

Lint Postgres EXPLAIN ANALYZE plans for slow-query anti-patterns: seq scans on filtered big tables, hash joins spilling to disk, nested loops on too many outer rows, sort spilling, planner row-estimate skew. Reads JSON or text plans.

Show all plans considered by the optimizer

A columnar analytical database engine built from first principles in Rust: encodings, a segment format with pushdown, a hand-written SQL parser and a logical planner.

MiniDB: A compact relational database engine with a SQL shell, persistent storage, indexes, transactions, and WAL support.

PostgreSQL의 최적의 비용 상수를 계산하는 AI 모델의 시연용 웹

Analyze PostgreSQL queries, visualize execution plans, and improve performance.

Rogue planets are starless planets, scientifically adrift in the cosmic dark alone

Small SQL query engine written from scratch in Go, with a volcano execution model, hash joins, aggregation, three-valued NULL semantics, and SQLite differential testing.

A SQL engine on top of keelstore: hand-written parser, cost-aware planner with index pushdown, volcano executor, and a three-way differential test

An open-source AI-powered natural language to SQL engine with deterministic query planning, explainable reasoning, and a self-learning semantic layer.